[openstack-dev] Solving the client libs stable support dilemma

Doug Hellmann doug at doughellmann.com
Sun Nov 16 14:06:02 UTC 2014

On Nov 15, 2014, at 5:50 PM, Jeremy Stanley <fungi at yuggoth.org> wrote:

> During the Kilo design summit session on Oslo versioning changes, we
> mostly resolved to switch to semver without alphas and pin stable
> branch libs to less than the next nontrivial version number
> (allowing for backports to fix bugs with subsequent point releases
> on a stable branch when needed). This however raises a question for
> other library dependencies, including dependencies on client
> libraries.
> Specifically, if we're going to limit the Oslo libraries consumed by
> stable branches of integrated release servers (bear in mind we
> already do this in one way by declaring they can't suddenly start
> requiring new dependencies), then how does that play out when we
> allow client libraries which are also dependencies of our stable
> release servers to depend on later versions of (or for that matter
> additional) Oslo libs?
> It seems likely we need to apply a similar versioning and branching
> model across our client libraries to address this, but this raises
> the end-user/app-dev interoperability concern we discuss from time
> to time: with a recent enough client library, you should be able to
> interact with multiple OpenStack deployments made from different
> integrated releases (or non-releases, continuous deployment, et al).
> The challenge, then, is to test interactions using our client
> libraries under development against older stable servers while
> installing those stable servers using different, older versions of
> the same client libraries. Perhaps something similar to how
> devstack+tempest jobs install devstack/server requirements globally
> on the system but then tempest requirements are installed separately
> into a virtualenv?

So we would pin the client libraries used by the servers and installed globally, but then install the more recent client libraries in a virtualenv and test using those versions? I like that.


> -- 
> Jeremy Stanley
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> OpenStack-dev at lists.openstack.org
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